Suzuki 2000 Grand Vitara SQ625 Service Manual page 61

TROUBLESHOOTING (DTC P0130)
STEP
1 Was "ENGINE DIAG. FLOW TABLE" performed?
2 HO2S-1 Output Voltage Check:
1) Connect scan tool to DLC with ignition switch OFF.
2) Warm up engine to normal operating temperature
and keep it at 2000 r/min. for 60 sec.
3) Repeat racing engine (Repeat depressing accelerator
pedal 5 to 6 times continuously to enrich A/F mixture
and take foot off from pedal to enlean) and check
HO2S output voltage displayed on scan tool.
See Fig. 1.
Is over 0.6 V and below 0.3 V indicated?
3 HO2S-1 Check:
1) With ignition switch OFF, disconnect HO2S-1
connector.
2) Check for proper connection to HO2S-1 at each
terminal.
3) If OK, connect voltmeter "1" and "2" terminal of
HO2S-1 connector.
4) Start engine and check voltmeter while repeating
racing engine.
Is over 0.6 V and below 0.3 V indicated?
4 Short Term Fuel Trim Check:
1) Run engine at 2000 r/min. for 60 sec.
2) With engine idling, check short term fuel trim
displayed on scan tool.
Is it within –20 to +20%?
Fig. 1 for Step 2
Normal
NG
0.6 V
0.3 V
ACTION
NG NG
ENGINE DIAGNOSIS (G16 / J20 ENGINES) 6-57
YES
Go to Step 2.
Go to Step 4.
"R" or "Gr/Y" circuit
open or short.
If wire and connec-
tions are OK, substi-
tute a known-good
ECM (PCM) and
recheck.
Intermittent trouble
or faulty ECM (PCM).
Check for intermit-
tent referring to
"Intermittent and
Poor Connection"
in Section 0A.
NO
Go to "ENGINE
DIAG. FLOW
TABLE".
Go to Step 3.
Replace HO2S-1.
Go to DTC P0171/
P0172 Diag. Flow
Table.